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Acquisitions and Dispositions - Additional Information (Details) $ in Millions |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) Business | Aug. 07, 2019 | Jul. 10, 2019 | Jul. 09, 2019 | Apr. 03, 2019 USD ($) | Sep. 30, 2020 USD ($) Business | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Business | Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired |  |  |  |  |  |  |  | $ 1.7 | $ (86.1)
Number of businesses disposed | Business | 4 |  |  |  |  | 4 |  | 4 |
Net proceeds from disposal of businesses | $ 5.8 |  |  |  |  |  |  |  |
Reclassification of foreign currency translation adjustments related to previously held equity interest |  |  |  |  |  |  | $ (6.2) |  | 26.3
Total contingent consideration payments for acquisitions |  |  |  |  |  |  |  | $ 13.0 |
Manpower Switzerland |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired |  |  |  |  | $ 317.5 |  |  |  |
Percentage interest acquired |  |  |  |  | 51.00% |  |  |  |
Cash consideration for acquisitions |  |  |  |  |  |  |  |  | 219.5
Acquired interests |  |  |  |  | $ 58.3 |  |  |  |
Cash and cash equivalents |  |  |  |  | 161.2 |  |  |  |
Total cash impact of the acquisition |  |  |  |  | 98.0 |  |  |  |
Post-closing settlement of net debt and net working capital settlement |  |  |  |  | 6.8 |  |  |  |
Payment of post-closing settlement of net debt and net working capital adjustments |  |  |  |  |  |  | 6.8 |  |
Reclassification of foreign currency translation adjustments related to previously held equity interest |  |  |  |  | $ 32.5 |  |  |  |
Experis AG |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage interest acquired |  |  |  |  | 20.00% |  |  |  |
Excluding Manpower Switzerland and Experis AG |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired |  |  |  |  |  |  |  |  | 39.5
ManpowerGroup Greater China Limited |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of diluted ownership interest, description |  |  |  |  |  |  |  | 36.87% as the underwriters exercised their overallotment option in full |
Foreign currency translation adjustment |  |  |  |  |  |  | 6.2 |  |
ManpowerGroup Greater China Limited | APME |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of controlling interest |  |  |  | 51.00% |  |  |  |  |
ManpowerGroup Greater China Limited | Initial Public Offering |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of shares issued in equity |  |  | 25.00% |  |  |  |  |  |
Percentage of diluted ownership interest |  |  | 38.25% |  |  |  |  |  |
Percentage of diluted ownership interest, if underwriter exercises of overallotment option in full |  | 36.87% |  |  |  |  |  |  |
Selling and Administrative Expenses |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
One-time loss on disposition |  |  |  |  |  | $ 5.8 |  | $ 5.8 |
Selling and Administrative Expenses | ManpowerGroup Greater China Limited |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash gain on deconsolidation |  |  |  |  |  |  | $ 30.4 |  |
Interest and Other Expenses (Income), Net | Manpower Switzerland |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Non-cash gain on disposition of previously held equity interest |  |  |  |  | $ 80.4 |  |  |  | $ 80.4

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